South Walnut Street Site is a superfund site located at 950 S. Walnut, Las Cruces, NM 88001. The Environmental Protection Agency (EPA) identifies sites such as South Walnut Street Site because they pose or had once posed a potential risk to human health and/or the environment due to contamination by one or more hazardous wastes. South Walnut Street Site is currently registered as an Active superfund site by the EPA. However, it is not on the NPL (National Priorities List), which means the EPA does not consider it one of the nation's most hazardous waste sites.